docs: def set_enclosure(self):
          """Parses enclosure_url, enclosure_type then set values."""
          try:
              self.enclosure_url = self.soup.find('enclosure')['url']
          except:
              self.enclosure_url = None
          try:
              self.enclosure_type = self.soup.find('enclosure')['type']
          except:
              self.enclosure_type = None
          try:
              self.enclosure_length = self.soup.find('enclosure')['length']
              self.enclosure_length = int(self.enclosure_length)
          except:
              self.enclosure_length = None